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Identification and rejection of scattered neutrons in AGATA
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2014 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 735, 267-276 p.Article in journal (Refereed) Published
Abstract [en]

gamma Rays and neutrons, emitted following spontaneous fission of Cf-252, were measured in an AGATA experiment performed at INFN Laboratori Nazionali di Legnaro in Italy. The setup consisted of four AGATA triple cluster detectors (12 36 fold segmented high purity germanium crystals), placed at a distance of 50 cm from the source, and 16 HELENA BaF2 detectors. The aim of the experiment was to study the interaction of neutrons in the segmented high purity germanium detectors of AGATA and to investigate the possibility to discriminate neutrons and gamma rays with the gamma-ray tracking technique. The BaF2 detectors were used for a time measurement, which gave an independent discrimination of neutrons and gamma rays and which was used to optimise the gamma-ray tracking based neutron rejection methods. It was found that standard gamma-ray tracking, without any additional neutron rejection features, eliminates effectively most of the interaction points clue to recoiling Ge nuclei after elastic scattering of neutrons. Standard Cracking rejects also a significant amount of the events due to inelastic scattering of neutrons in the germanium crystals. Further enhancements of the neutron rejection was obtained by setting conditions on the following quantities, which were evaluated for each event by the Cracking algorithm: energy of the first and second interaction point, difference in the calculated incoming direction of the gamma ray, and figure-of-merit value. The experimental results of Cracking with neutron rejection agree rather well with GEANT4 simulations.

Place, publisher, year, edition, pages
2014. Vol. 735, 267-276 p.
Keyword [en]
AGATA, gamma-Ray tracking, Segmented HPGe detectors, Neutron scattering, Neutron-gamma discrimination, Cf-252
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-213889DOI: 10.1016/j.nima.2013.09.035ISI: 000327494600037OAI: oai:DiVA.org:uu-213889DiVA: diva2:683790
Available from: 2014-01-06 Created: 2014-01-05 Last updated: 2017-12-06

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Nyberg, Johan

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